手法を比較

	道具的ケーススタディ	アクションリサーチ	Grounded Theory
分野	質的手法	質的研究	質的研究
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1995	1946	1967
提唱者	Robert E. Stake	Kurt Lewin; expanded by Kemmis, McTaggart, Reason & Bradbury	Barney Glaser and Anselm Strauss
種類	Qualitative research method	Method	Method
原典	Stake, R. E. (1995). The Art of Case Study Research. Sage Publications. ISBN: 978-0803957671	Lewin, K. (1946). Action research and minority problems. Journal of Social Issues, 2(4), 34–46.	Glaser, B. G., & Strauss, A. L. (1967). The discovery of grounded theory: Strategies for qualitative research. Aldine.
別名	instrumental case research, theory-building case study, illustrative case study, issue-driven case study	Participatory Action Research, PAR, Collaborative Inquiry	GT, Grounded Theory Approach
関連	6	1	3
概要	Instrumental case study is a qualitative research design, formalised by Robert E. Stake (1995), in which a specific case is studied primarily to gain insight into an external issue or theoretical question — not because the case itself is intrinsically important. The case serves as an instrument for understanding something broader: a policy problem, a theoretical proposition, or a generalised phenomenon. One or several cases are selected because they are expected to illuminate the issue particularly well, and the researcher moves fluidly between the case and the issue throughout the study.	Action research is a collaborative research methodology in which researchers work with practitioners and community members to investigate a problem, implement change, and evaluate outcomes, cycling through reflection, action, and learning. Developed by Kurt Lewin (1946), action research bridges research and practice, aiming simultaneously to produce knowledge and practical improvement.	Grounded Theory (GT) is a systematic qualitative research methodology in which theory emerges directly from data through iterative analysis, rather than being imposed before data collection. Developed by Barney Glaser and Anselm Strauss in 1967, GT prioritizes generating explanatory frameworks grounded in evidence.